OpenCV imshow（）防止Qt/python崩溃

Question

import socket
import cv2
from PyQt4 import QtCore, QtGui, uic

while True:
    data, addr = self.sock.recvfrom(10240)

    # after some processing on data to get im_data ...
    self.im_data_color_resized = cv2.resize(im_data, (0, 0), interpolation = True)

    # using OpenCV to show the video (the entire code works with cv2.imshow but not without it)
    cv2.imshow('Real Time Image', self.im_data_color_resized)
    cv2.waitKey(10)

    # using QLabel to show the video
    qtimage = cv2.cvtColor(self.im_data_color_resized, cv2.COLOR_BGR2RGB)
    height, width, bpc = qtimage.shape

    bpl = bpc * width
    qimage = QtGui.QImage(qtimage.data, width, height, bpl, QtGui.QImage.Format_RGB888)

    self.imageViewer_label.setPixmap(QtGui.QPixmap.fromImage(qimage))

Answer 1

您需要刷新事件队列，以便更新您的GUI。在setpixamp函数之后添加qtgui.qapplication.processevents()。

它与cv2.waitkey()一起工作，因为它已经在内部刷新了绘画事件，允许刷新Qt GUI。但我建议不要依赖于此攻击，并使用processevents显式刷新Qt事件。

您可能还希望将此处理循环放在它自己的线程中，以使GUI/主线程具有响应性。